Excellence in Research: Nano-Structured Functional Ferromagnets

卓越的研究：纳米结构功能铁磁体

基本信息

批准号：
2055432
负责人：
Abdellah Lisfi
金额：
$ 33.2万
依托单位：
Morgan State University
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2021
资助国家：
美国
起止时间：
2021-08-15 至 2025-01-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=2055432&HistoricalAwards=false
关键词：
Excellence Research Nano Structured Functional

项目摘要

NON-TECHNICAL SUMMARY:Magnetostrictive materials are those that can elongate or contract when exposed to an external magnetic field. Highly magnetostrictive materials with a reversible magnetic character are highly suited for applications in modern technology such as sensors, actuators, and underwater communication devices. This research advances scientific knowledge of nanostructured ferromagnets that display a large mechanical response under small magnetic fields. A variety of magnetic materials are studied, including metallic alloys and ceramics in the bulk and thin film forms. This research program offers unique opportunities in the education and training of graduate and undergraduate students in materials synthesis and state-of-the-art characterization techniques. These efforts increase the competitiveness of minority students in the Science and Engineering disciplines and expand the pool of talented African-American scientists and engineers, thereby enhancing the high-technology minority workforce. The outreach to Maryland high schools engages and encourages high-school students in science and engineering.TECHNICAL SUMMARY:This award supports research on magnetic materials combining small magnetocrystalline anisotropy with large magnetostriction. The hypothesis is that the fundamental mechanism giving rise to this unusual combination of properties consists of breaking the theoretical spin-orbit coupling link valid for single-phase solids via a two-phase nanostructures. The systems of study include Fe-Ga,Al,Ge solid solutions and nanostructured cobalt ferrite in the form of nano-chessboard whose properties are probed by magnetic characterization techniques. Diffraction techniques using x-ray and neutron radiation determine the underlying nanostructures. Transmission electron microscopy of these model materials under stress in situ are also crucial experiments to elucidate the role of the nanostructure in magnetostriction. These activities aim at the development of a common science foundation for this materials class. The engagement of both undergraduate and graduate students in this research builds research experience and expertise in the field of magnetic materials.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术摘要：磁性材料是那些在暴露于外部磁场时会伸长或收缩的材料。具有可逆磁性特征的高度磁性材料非常适合于现代技术（例如传感器，执行器和水下通信设备）的应用。这项研究促进了纳米结构的铁磁体的科学知识，这些知识在小磁场下显示出很大的机械响应。研究了各种磁性材料，包括散装和薄膜形式的金属合金和陶瓷。该研究计划为研究生和本科生的材料合成和最先进的特征技术提供了独特的机会。这些努力提高了少数族裔学生在科学和工程学科中的竞争力，并扩大了才华横溢的非裔美国科学家和工程师的竞争力，从而增强了高科技少数群体的劳动力。与马里兰州高中的宣传有关科学和工程学的高中生。技术摘要：该奖项支持对磁性材料进行研究的研究，这些材料结合了小型磁晶和大型磁通状学。假设是，产生这种特性的这种异常组合的基本机制包括打破对单相固体通过两相纳米结构有效的理论自旋轨道耦合链接。研究系统包括Fe-GA，AL，GE实心溶液和纳米结构的钴铁素体的形式，其特性是通过磁性表征技术探测的。使用X射线和中子辐射的衍射技术决定了基础纳米结构。这些模型材料在应力原位下的透射电子显微镜也是阐明纳米结构在磁结构中的作用的关键实验。这些活动旨在开发该材料类的普通科学基金会。本科生和研究生在这项研究中的参与旨在建立磁性材料领域的研究经验和专业知识。该奖项反映了NSF的法定任务，并且使用基金会的知识分子优点和更广泛的影响评估标准，被认为值得通过评估来提供支持。